3.5 is EOL
As you see in document linked - first update tg3 driver, if no luck disable TSO by commandline + down up of interface.
Obviously as interface goes down you lose connectivity if port group does not have enough redundancy.

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If you dont find the option mentioned in "advanced" options for host, then try perl API (esxi_advcfg.pl) If you dont find the option your ESXi predates TSO acceleration (should not) available since ESX 3.0

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